| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an optical receiver capable of precosely and correctly decoding two data signals. <P>SOLUTION: The optical receiver is provided with: an optical coupler 2 for branching a DQPSK (Differential Quadrature Phase Shift Keying) signal, two one-bit delay interferometers 3, 4 for decoding the DQPSK signal; two differential light receivers 5, 6 for respectively performing the photoelectric conversion of optical signals from the two one-bit delay interferometers 3, 4; two discriminators 7, 8 for respectively discriminating signals photoelectrically converted by the two differential light receivers 5, 6; a logic-tributary decision circuit 12 for judging the logic and tributary information of data discriminated by the discriminator 7; a phase control part 9 for controlling the one-bit delay interferometer 3 on the basis of a control signal obtained from an error signal detected by branching an output from the differential light receiver 5 and the logic and tributary information of the data discriminated by the discriminator 7; and a phase control part 15 for controlling the one-bit interferometer 4 on the basis of a control signal obtained by adding fixed voltage to the control signal of the phase control part 9. <P>COPYRIGHT: (C)2007,JPO&INPIT |
